Multiple Choice
Why can astronomers not tell from what direction a particular cosmic ray started toward the Earth?
A) all cosmic rays are scattered by dust in interstellar space
B) we don't believe cosmic rays have a particular source; they have always been circulating around the Galaxy
C) cosmic rays are reflected by interstellar matter and thus are always reversing direction
D) cosmic rays are charged particles and are thus spiral around the Earth and the Galaxy's magnetic field
E) cosmic rays are very strongly Doppler shifted
Correct Answer:
Verified
Correct Answer:
Verified
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